Kyuu is accepted to the DDS for solving the ""Suicide"" case (see ep 1). So he is tested to see if he can make it into any group(Q, A, B, C, D). The test is: On an island, the Legendary Jack the Ripper strikes. There are suspects, but is it the REAL Jack the Ripper, or a mere imitation?
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Ready to Watch Tantei Gakuen Q, Season 1, Episode 2?